As of Version 7.0, NonlinearRegress has been superseded by NonlinearModelFit and is part of the built-in Mathematica kernel.
The built-in function FindFit allows you to perform nonlinear least squares fitting. The function NonlinearRegress gives a number of regression diagnostics and allows you to ...
As of Version 7.0, BestFitParameterDelta has been renamed to "BetaDifferences" and has become a property of LinearModelFit.
As of Version 7.0, BestFitParameters has become a property of LinearModelFit and NonlinearModelFit.
As of Version 7.0, CatcherMatrix has become a property of LinearModelFit.
As of Version 7.0, CovarianceMatrixDetRatio has been renamed to "CovarianceRatios" and has become a property of LinearModelFit.
As of Version 7.0, FitResiduals has become a property of LinearModelFit and NonlinearModelFit.
As of Version 7.0, ParameterBias has become a property of NonlinearModelFit.